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The most common method for detecting limit values is to measure and calculate standard deviations (SD). However, the calculation formula for the measurement of SD is complicated and there are large errors in the formula16. The traditional method of calculating mean and SD of the measured signal is to add the absolute value of the difference signal of the measurement period, accumulate the mean value in blocks; then, calculate the SD in the same manner. The method shows good stability and accuracy, but it consumes a lot of times, occupies a large number of modern communication tools, and causes a certain amount of stress on personnel. Moreover, the existing methods of detection of the signal do not comply with real-time detection requirements. In view of this, the traditional calculation method is unable to meet the requirement of real-time detection. This requirement applies to the detection of low-frequency pressure fluctuations in wind tunnels. Therefore, a new detection method of low-frequency pressure fluctuations in wind tunnels based on the discrete cepstral techniques is proposed. This method has high real-time ability, is simple and convenient, and has good precision and stability. The test results show that this method can meet the requirements of real-time detection in wind tunnels. This method can be widely applied in other sectors of industry.
The material damage characteristics of the pressure vessel made of medium carbon steel (with various proportions of carbon and manganese steels), such as the C factor, H factor, and the quasi-static pressure factor, are estimated in accordance with the characteristics of the medium carbon steel. The material damage characteristics of the pressure vessel made of high carbon steel (with various proportions of carbon and manganese steels), such as the C factor, H factor, and the quasi-static pressure factor, are estimated in accordance with the characteristics of the high carbon steel.
The estimate of the fracture characteristic of the pressure vessel made of stainless steel is made according to the material damage and fatigue guidelines for the steel. The material damage characteristics of stainless steel are estimated based on the pressure vessel fracture characteristics and safety standard limit values. d2c66b5586